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Definitive determination of first order character of the magnetocaloricmagnetic transition remains elusive. Here we use a microcalorimetry techniquein two modes of operation to determine the contributions to entropy change fromlatent heat and heat capacity separately in an engineered set of La(Fe, Mn,Si)13 samples. We compare the properties extracted by this method with thosedetermined using magnetometry and propose a model independent parameter thatwould allow the degree of first order character to be defined across differentfamilies of materials. The microcalorimetry method is sufficiently sensitive toallow observation of an additional peak feature in the low field heat capacityassociated with the presence of Mn in these samples. The feature is of magneticorigin but is insensitive to magnetic field, explicable in terms ofinhomogeneous occupancy of Mn within the lattice resulting in antiferromagneticordered Mn clusters.

Determining the First Order Character of La(Fe,Mn,Si)13